Cleaning/preserving white sidepanels....

Home Depot should have it. They sell "Plexus" too, I've bought it there myself.

Walmart also lists it online- 8 oz. from $6.86

Jet.com- 8 oz. $5.48

Essential hardware online lists - 8 oz. $4.39

Amazon has it too.

Various prices all over the place.

If you have an "Ace Hardware". They should all carry it too. Item (1999990A)

"Optix" Acrylic sheet plastic is a product of "Plaskolite" itself and is available at all Ace Hardware stores. So it stands to reason they would sell the cleaner for this product of the same brand. They should also sell the "Plaskolite" brand scoring/cutter tools to cut the same product. It isn't hard to find.
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This info below is right off the "Plaskolite" website:
Taken from there own Information and care of the product itself.

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Cleaning

Clean Plaskolite acrylic sheet with a mild soap solution, or a commercially available plastic cleaner, such as Plaskolite Plastic Cleaner, and a lint free cloth. To remove grease, oil, or tar deposits, use hexane or kerosene, followed by a soap solution.
Avoid cleaners containing ammonia or alcohol.

Neutralizing Static Electricity

Plaskolite acrylic sheet can be neutralized with an anti-static cleaner such as Plaskolite Plastic Cleaner, or ionizing air guns, and bars.

I'd like to try the Blue Diamond wash compound. Where can I purchase it?

Thanks. I emailed him. No distribution in the SoCal area yet but he gave me the name of a dealer that can ship the product to me.