I work with the owners of our local room and have a table in my house. Bought a Diamond ball cleaner/polisher for home use this past summer from Manning Cues. Cost was $500 + $130 shipping--shipping varies from state to state. I got the unit that cleans 9 balls at a time. Cleaning balls by hand...
Believe it or not, YES!!! Just a couple of months ago, the owner of the only pool hall in my area (in operation for more than 30 years with 16 tables) told me that they sprayed blue Windex on their tables--all covered in Simonis cloth-- for years to address blemishes and restore uniform color...