Meguiar's D120 turning brown

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buffdude

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Does anyone know why Meguiar's D120 Glass Cleaner Concentrate turns brown, and the bottle turns brown, after being diluted? This occurs approximately 3-4 weeks after being diluted. Does this mean the product has turned bad? Will this create problems if used on clear plastics? Will this product harm other plastic parts?
 
Seems to be normal for the bottle to yellow from the dye in the product.

My entire gallon turned brown. I ended up tossing it.
 
I had a diluted bottle for a year and it stayed blue-ish. Then the next bottle I diluted turned light brown/green within a few weeks but appears to clean fine still. The concentrate itself is still blue though, I will continue to use it.
 
I've heard of this before awhile ago, so it may not be too big of an issue, especially if it is still cleaning okay. If it's wiped immediately after spraying, then no problems should occur, IMO.
 
The Guz said:
Seems to be normal for the bottle to yellow from the dye in the product.

My entire gallon turned brown. I ended up tossing it.
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agreed (sticky as well). i rarely use a dedicated glass cleaner these days except for the inside (tint). other than that a qd, spray wax, and/or rinseless wash works fine for the exterior when wiping it down along with the paint. if i were to buy a dilutable glass cleaner the 3D offering seems to go a long way with a 50:1 dilution..

3D Super Glass Cleaner - 128 oz.
3d-super-glass-cleaner-128-5.gif

3D Super Glass Cleaner - 64 oz.
3d-super-glass-cleaner-3.gif

Properly dilute 3D Super Glass Cleaner 50:1 (2.5 oz. per 1 gallon) with water.
 
Do the bottle and the gallon jug have sunlight on them where you store them during some time of the day? It's a common reaction to some dyes to change colors if it's gets exposed to sunlight. Even if it's gets heated from high temperatures where you store it can be changing the color of the product. It's just a generally thing and I have not any experience with D120. So it can be something else that does this.
 
The diluted product along with the undiluted product is stored in a dark closet. What is strange to me is it's only the diluted product that turns brown. The undiluted jug has never turned brown, and the undiluted product is still blue. I use distilled water and dilute 10-1. I have reach out to Meguiar's but have yet to receive a response.
 
It would be interesting to see if it is due to a pH change (not sure of pH of distilled water, it starts out neutral but as it sits CO2 dissolves in it shifting it slightly acidic). They might keep The stock slightly basic to give the pretty blue color (depending on the dye, a dye can be blue at higher pH n the same dye can be yellow brown at lower pH). Just a guess, let us know what you find out.
 
SWETM said:
Do the bottle and the gallon jug have sunlight on them where you store them during some time of the day? It's a common reaction to some dyes to change colors if it's gets exposed to sunlight. Even if it's gets heated from high temperatures where you store it can be changing the color of the product. It's just a generally thing and I have not any experience with D120. So it can be something else that does this.
Click to expand...

I had not used it in some time. The gallon sat in the cabinet and when I pulled it out last time it was all brown. The scent became like a sour blueberry. But the 32 oz Meguiar's spray bottle became yellow from the dye.

The gallon is so cheap that I did not mind tossing it. I just won't be buying it again. I will stick with Sonax or Spray Way Glass Cleaner. They are better in my opinion/experience.
 
According to Meguiar's, it is just a by-product of the chemistry. It does not affect performance whatsoever.
 
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