How can I get rid of the gunk in my whirlpool tub? - The Washington Post
How to Clean a Jetted Tub (No More Gunk in the Water!) - Bob Vila
Spa Jet Cleaner - Hot Tub Flush & Spa Purge Chemical - Fast Acting Spa Jet Line Cleaner for Hot Tubs & Jetted Tub Cleaner - Bathtub Jet Cleaner & Spa Purge
How to Clean Bathtub Jets Thoroughly in Simple Steps | LoveToKnow