If you can figure out the secret sauce thats used they are probably effective.
Tom, I've had more success with H2O2 and sunshine.
Ron; Here are the spotting instructions for our UV stain removal:
"These are concentrations of Dynachem Brightener (15% peroxide +penetrant) used for spotting operations for removing water marks, some disperse dyes , or yellow stains.
Concentrations of peroxide used are 7.5% to 15%.
It is done ideally at warm temperatures and pH of ~9.
Use the Brightener from [50% to full strength],
& raise the pH of the mix with DC Shampoo (foaming agent) at 1 oz/quart.
It should begin to foam quickly.
Brush the foaming mixture lightly onto the stain surface with a paint brush.
Apply the UV light to the stain for 10-30 minutes.
Check for removal of stain, & rinse with cold water if satisfied. "