RV Level Gauge Cleaner, 19 oz - Thetford 24545 [VERSATILITY]: Thetford's Level Gauge Cleaner is designed to work with RVs and boats [FUNCTIONALITY]: Dissolves tissue sludge and soap scum build-ups, restoring level sensor operation fast [UTILITY]: Prevents build-ups on probe and tanks, when used regularly [CONVENIENCE]: Formulated to work with grey or black water tanks [SAFETY]: Level Gauge Cleaner is 100% biodegradable