Not being a chemist, and judging by the smell, I think that the Micro-set type products have alcohol and water and possibly a detergent, while the Micro-Sol type products have acetic acid and a wetting agent. Acetic acid is the acid in vinegar, so maybe you could try a home brew. The commercial solutions last years for me, so the cost and availabilty are not a problem, but experimentation is always interesting.