I quit getting hot water in my garden tub which is seldom used. Closed the stop-check valve on the cold side and left just hot side open. Very little water flow. After researching symptons on the web, determined that it was likely a clogged cartridge causing the problem. I've purchased a replacement Moen 1222 cartridge (which includes the plastic removal tool) and I purchased a metal removal tool as well. The plastic didn't budge the cartridge at all and the metal removal tool provided minimal, side to side, movement of the cartridge. I kept trying it and one of the metal flanges finally broke. Does anyone have a recommendation of something chemical that can be used to loosen this?
Some additional information - I did remove the retainer clip before trying to remove and I have hot water in every other faucet in the house. I also tried taping with a hammer to try and loosen it. I even sprayed CLR cleaner in the retainer clip slot and around the face in hopes that it might disolve any buildup.
Any suggestions would be greatly appreciated. Thank you!