The CartWashCheck is designed to challenge the mechanical efficiency of the cart washer. These convenient tests can be quickly and easily adhered to a metal surface with the peel-off adhesive that leaves no residue. Place these tests on surfaces furthest from the washer jets or where you suspect coverage is most difficult. The special hydrochromic ink will change color only if moistened by water. This demonstrates that water is reaching the area tested, indicating proper mechanical action. Further, the heat sensitive ink will change color at 120F, documenting that this temperature was reached during the cycle.