Thing about cheap US units is, well, they’re cheap. They may not be very powerful, they may not distribute the energy very well, they may not even meet spec. Just sayin’.
I suggest that you rent or borrow a VPI 16.5 and clean the lot. Then select what you want to keep and pay someone to do a good US clean of only those. You’ll come out ahead unless you want to keep most of them.
NEVER use tap water unless you know FOR SURE that it's near distilled spec. Otherwise you may get mineral deposits which can only be removed by US cleaning. Ask me how I know.
I suggest that you rent or borrow a VPI 16.5 and clean the lot. Then select what you want to keep and pay someone to do a good US clean of only those. You’ll come out ahead unless you want to keep most of them.
NEVER use tap water unless you know FOR SURE that it's near distilled spec. Otherwise you may get mineral deposits which can only be removed by US cleaning. Ask me how I know.