I was hoping someone else would jump in...
Since you have some time now I'd do a little experimenting to see what the cleaning/streaking properties of different cleaning products are. I'm thinking using drinking glasses, glass jars, etc you might have around, one for ea h product your going to test. Mix up some water & dirt, swirl it around in each glass, dump then let them sit in the sun for a couple of days to get the dirt nice & baked on. I don't know what products you have available but in general I'd try dish soap, dishwasher soap, your APC, maybe a glass cleaner, peroxide, etc. Include your meth too as a comparison. Then just swirl & shake each with a product in them & see how they do.
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