RST-5 USA (Port St. Lucie, Fla.) is featuring RST5, its "green" cleaner solvent, designed to remove uncured resins, polyurethane adhesive/sealant, silicone caulking and sealant from tools, surfaces and skin at what the company says is less then half the cost of competitive solvents. RST5 is said to be the only product that has been dermatologically tested on humans and proven to be non-allergenic and non-irritant. RST5 costs less then $0.40/lb and does not evaporate. It's provided in concentrate, to be diluted 1:20 with water. It poses no fire/explosion hazard and is nontoxic.