Forgot to mention that this solution, in the post above, "Castellani" solution, goes on "purple" and is hard to get off stuff...
So...be careful that you don't spill it. I took a large sponge block about 2 1/2 inches tall by 4 inches wide...and cut a hole in the MIDDLE of it with sissors, and stuck the little "Castellani" solution bottle down into the hole. So when I use it, it is in a large square sponge base that won't tip over!!! Works perfectly.