Wholesale Spotfree Tank Deodorizing Tabs If you have a dirty or smelly toilet bowl, these Spotfree Tank Tabs are the solution. The tabs are an in-tank automatic toilet bowl cleaner that cleans and deodorizes with every flush! They also fight hard water stains. Just drop a tab in the toilet tank and allow 10 minutes before flushing to permit the toilet bowl cleaner to activate. When the blue color disappears in your toilet, simply drop in another tab. 3 tabs per pack.