Add extra sanitizer ( chlorine or bromine), just a small amount will do similar to a typical dose or two, purge for 30 minutes. Wipe away sticky gunk. Add 1/2 additional Ahh-Some dose. Run for another 30:minutes. Wipe away any dislodged gunk. Shut the tub off. Wait 3-4 hours and adda 1/4 dose of Ahh-Some. Run the jets for ten minutes. Wipe gunk. That should do it. Ok to let it set overnight but do not run the jets. Shut the entire system down. Run jets a few minutes in the morning. Drain, rinse and wipe clean. Refill and balance the water.