If you can remove it without making it a big project:
- Drain
- Add water and a strong degreaser (such as dish soap). Slosh around and drain.
- Observe the inside with a flashlight to see if there is still crud and repeat.
- I've known people who insert a power washer wand to help get the tough stuff.
- Drain and let fully dry.
- Reinstall
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV