If you type in "personal breakthrough cleaning" in the search you can find the original thread. It is a couple pages but I copied one of the post's in regards to the safety of the product.
"I missed your question but saw it as I was about to get back to work. So I called the 1800 number on the can to spoke to Turtle Wax and surprisingly they put me in touch with someone who knows the chemistry and purpose of this product. Fist off in answering your question Lucy they said that the product is designed not to leave any residue because it would interfere with it ability to abrasion and remove layers of dirt, oxidation and paint, also would interfere with wax polish and oils designed to be applied later, this product has none. The product is a non-petroleum water based carrier with suspended silica super fine dust and volcanic ash designed to remove dirt, minerals, oxidation and paint if necessary. The reason why it doesn't scratch the glass is because its a super fine powder abrasive of silica & Volcanic ash which has the exact same hardness as glass 6. so the result is a wash with only the softer materials like dirt, calcium and
magnesium being removed and the glass only getting sharp micro surfaces smoothed out or polished. The coarseness would have to be greater to see any abrasion marks but since the powder far exceeds 2500 grit it cannot visibly scuff glass.
IMHO Residue if any comes off with the
ammonia cleaner which dissolves all greases and oils and waxes, then vinegar removes that followed by RO which absorbers any toxins because RO has no ions it pulls in anything it can. But besides all this the amount of any residue after all that cleaning would be in the PPB's (Parts per billion) which means there are far more contaminants that would be sucked in through your air pump then off the surface of the cleaned glass, so no worries."
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