You do NOT clean a thermocouple.
They are really inexpensive and when they are giving problems have a LMP / or Gas fitter replace it
Spillage , bad thermocouple
There could be several reasons why your hot water tank won't stay lit. Some common causes include a faulty thermocouple, a dirty pilot light, or a gas supply issue. It is recommended to have a professional plumber inspect and repair the hot water tank to determine the exact cause of the problem.
To effectively clean a hot water tank, first turn off the power or gas supply to the tank. Next, drain the tank completely and flush out any sediment or debris. You can use a mixture of water and vinegar to clean the tank, or a commercial descaling solution. Be sure to rinse the tank thoroughly before refilling it and turning the power or gas supply back on.
The best methods for effectively cleaning a hot water tank using a hot water tank cleaner involve draining the tank, adding the cleaner according to the instructions, allowing it to sit for the recommended time, and then flushing the tank thoroughly with clean water. Repeat the process if necessary for a thorough cleaning.
To ensure optimal performance and efficiency, it is recommended to clean your hot water tank at least once a year. This helps prevent sediment buildup and maintain the efficiency of the heating elements. Regular maintenance can also extend the lifespan of your hot water tank.
There could be several reasons why your hot water tank won't stay lit. Some common reasons include a faulty thermocouple, a dirty pilot light, or a gas supply issue. It's best to have a professional plumber inspect and repair the tank to ensure it functions properly.
To clean out a hot water heater effectively, first turn off the power and water supply. Drain the tank completely, then flush it with a mixture of water and vinegar to remove sediment and mineral buildup. Scrub the tank with a brush if needed. Refill the tank, turn the power and water back on, and check for leaks.
To clean a hot water heater effectively, first turn off the power or gas supply. Next, drain the tank completely to remove sediment buildup. Use a brush or vacuum to clean the inside of the tank. Finally, refill the tank and turn the power or gas supply back on.
Fill with water, maintain 2-3 days, stir, empty the tank; wash again with hot water.
Shut off the gas let the tank cool THEN get a soft cleaning agent such as soft scrub or Fantastic , clean soft cloth and carefully clean the out side of the tank
There are many pictures of this on Google.
$6 to $10 depending on where you are and where you get it from.