Shannon Lush gets it wrong #8

Amongst the many errors in the advice that Shannon Lush gave in her advice on 6PR was her advice not to use Oven Cleaners to clean ovens, but to use a mixture of bicarb soda/vinegar to clean ovens.

In other words what we are expected to believe is that the chemists who have designed products specifically to clean ovens don’t know what they are doing and that she, with no scientific qualifications whatsoever, knows better, and of course the very opposite is the case.
Oven cleaners work by a chemical process called saponification. That is, they literally convert the oil and grease in your oven to a soap.

Here is the reaction

This is why it all wipes up with a sponge so easily afterwards – you’re literally wiping up soap.

Bicarb will not do this as it isn’t alkaline enough, and especially after it has been neutralised by adding vinegar to it.

Shannon Lush gets it wrong #7

Shannon Lush once again regaled us with her advice on home cleaning on 6PR on Monday.

One listener called in and said that he had a shirt that had one white sleeve and one black sleeve. He wanted to know how to wash it such that the brightness of the white was enhanced. Shannon’s answer referred solely to the washing temp, and suggested that if the water was “blood temperature” that this would achieve the desired result. This answer is partly right – with modern detergents warm water produces optimum results. But the point is that such a detergent is required. Premium brands such as OMO or Biozet contain optical brighteners that not only will make the white brighter, but will also make the black a more vivid black.

Next a listener wanted to know how to get a wasp nest off the cement rendering of his house. He said that he had used high pressure to remove it but it hadn’t worked. Shannon’s answer was, firstly, that high pressure cleaning only “forces dirt in further.” I’m sure this information would be news to the many businesses that use high pressure water to clean houses and driveways. We were then told that the wasp nest would release endorphins. I think she meant pheremones – endorphins are the natural feel-good chemicals that your body releases as a response to intense exercise.

The advice to use glycerine/tea tree oil to dislodge the nest is sound, however. Glycerine has pretty good stain removing properties due to its de-facto surfactant structure. But caustic soda would work better. Spray the nest with an oven cleaner, wait half an hour or so, and then blast with the HP cleaner and it will come away.

Then came a pantry moth question. Shannon’s answer was to use Bay Leaves, as they “release enzymes that render moths sterile.” This sounded a little far-fetched to me, but I don’t know everything so I investigated. I asked Bryce Peters, a well-known entemologist at UTS in Sydney.

His verbatim reply was:

I have not heard that one. I know some people claim Bay leaves repel moths. I have not seen any evidence of that.

Shannon Lush gets it wrong #6

Shannon Lush once again regaled us with her home cleaning tips on 6PR today.

My general comment on her expertise is that about a third of what she says is good advice; about a third of what she says will work, but is exceedingly complicated (and a much simpler solution is available), and about a third is completely wrong.

In the second category, Simon B asked her how to get coffee out of carpet. Her answer was a complex, three-step procedure involving paper towels, glycerine, and a soap stick. Would it have worked? Probably, but if you understand the chemistry of coffee there is a much simpler solution.

The brown colour produced by the roasting of coffee beans is a class of chemical called melanoidins, the naturally occurring result of any roasting process with sugars and amino acids. The same class of chemical is responsible for the brown colour of the crust of bread that has been baked, for example, or any biscuits.

Consequently, there is a very simple and obvious way to remove these compounds – enzymes. Spray some White King Stainlift laundry prewash on the coffee and you’ll see it disappear after a few minutes – no wiping or scrubbing will be required. An alternative would be to oxidise it with Preen Oxy-Action, but the enzymatic formula of the White King would probably work better.

Image result for white king stain lift

In the third category was her advice to replace 2/3 of your laundry powder with bicarb soda.

Unfortunately, this advice is as wrong as it could possibly be. Bicarb soda has weak cleaning properties at best. If you use it as a paste its scouring effect, along with its mildly alkaline nature, will clean some things. But as I’ve said before, anything bicarb will do, washing soda will do better.

But a few spoonfuls tossed into your wash will achieve zero, zip and zilch.

Washing powders are highly sophisticated formulas that contain up to 9 or 10 different components (surfactants, enzymes, oxidizers, builders, alkaline salts, fluorescing agents, antiredeposition agents, free-flow agents, fragrance, softeners), and you simply cannot replace these with any one chemical – particularly bicarb soda, which has almost no cleaning properties whatever. If a chemical existed with such magical properties, you can be sure that I would know about it, as would the thousands of chemists worldwide that formulate the laundry products that we see on our shelves.

But then after this we learned that apparently using bicarb will make your clothes dry faster, and stop them getting stained as easily in the future. No mechanism was given for this. She seemed not to be aware of the fact that bicarb soda is water soluble and it will all wash out in the rinse and spin cycles.


Shannon Lush gets it wrong #5

Yesterday on 6PR Shannon Lush once again gave us her cleaning advice as part of her regular show. As before, however, a substantial amount of that advice was wrong.

  1. The presenter, Simon Beaumont said that he had overspray from bore water on his car and it had left white marks.  Shannon told him that these marks had damaged his paint and he was to use “sweet almond oil” to attempt to cover it up. This advice is completely incorrect.  The white marks are simply dried mineral deposits from the water and are easily removed with any acidic kitchen or bathroom cleaner.  Ajax Spray and Wipe (lactic acid), Shower Power (citric acid) and a host of other cleaners will easily remove these marks.  Alternatively, they can simply be polished off with Brasso. Paints on modern cars our extremely advanced two pack formulations and are very chemically resistant.  The days of overflowing petrol leaving marks on your paint (acrylic) are long gone, and there is no commonly available chemical or product that you have lying around the house that you cannot use on your car with complete safety.
  2. A listener asked how to get residue off his bathroom floor that had been left by a rubber mat.  Shannon’s advice was to put salt on it and then brush it away.  I suppose an abrasive like this may work eventually, but a far quicker approach is to use acetone
  3. A couple of callers had questions about glass.  The first question was how to get paint overspray off glass.  Shannon’s advice was to essentially use a paint scraper as you shouldn’t use any chemicals that may damage glass.  This was followed up by a question about glass that had been damaged by soap scum. For a start, glass is extremely chemically resiliant, and there is no chemical you might want to try to get paint off with that will damage it. I have explained the chemistry of glass (shower screens) elsewhere but with the paint on the glass I’d try acetone first. Failing that, use a heat gun – the paint will blister up and peel away. But don’t blast the window with the heat gun on it’s highest setting immediately or you might crack it. Warm it up slowly.
  4. The last one falls into the “has anyone ever actually done this?” category – a used tea bag in a panty hose to get retic overspray off an anodised window frame?? Please tell me if you have actually done this. For a start, contrary to the advice that was given, anodised window frames will not be damaged by irrigation water. That’s the whole point of the anodising – it’s an extremely stable proprietary coating that is resistant to anything it encounters in and around the home. The irrigation (mineral) marks will be easily removed by any acidic kitchen or bathroom cleaner (Easy Off BAM is perhaps the product of choice with its sulphamic acid)

Once again, please bear in mind that Shannon Lush is not a chemist. She has no formal training in chemistry whatsoever.

Shannon Lush gets it wrong #4

Yesterday on 6PR Shannon Lush gave to a listener what is probably the most ridiculous advice I have ever heard given on-air about anything.

A listener called in with an ink stain from a biro on a beige leather sofa.

Shannon’s advice to remove it was to use rotten milk. She told the listener to put milk out in the sun for three days, and then after it has gone rotten, rub the “chunky bits” over the ink stain.

Two questions immediately spring to mind:

1. For all the people who politely say “thanks very much” when such advice is given, has anyone actually done this? Has anyone ever actually followed this advice? Or after ringing off do they jump onto Google to try to find something more practical?

2. What do you do about the smell of rotten milk all over your sofa (which brings me        back to Q1)?

Apparently she has never heard of isopropanol, otherwise known as isopropyl alcohol.

Image result for isopropyl alcohol

This stuff, available from Jaycar Electronics, will get it off easily with a bit of rubbing. It’s probably the most versatile and useful cleaning chemical in existence, so keep it around for 1001 other applications.

An alternative is acetone

Image result for acetone bunnings

Be a bit careful with acetone though – it’s a more aggressive solvent than isopropanol. It won’t damage the leather, but will probably leave the surface dull as it will strip the natural oils from the surface. This is easily restored, however, with neatsfoot oil