Mildew odor bathroom

[thefishingal]

Uggg I have a mildew odor in my bathroom and not sure why? I looked in cabinet and its dry. Inside shower stall has odor too. I have wiped everything down. Not sure where it's coming from. Anyone have any ideas?
I think it's going to make me nuts lol

[thefishingal]

I checked for leaks underside and didn't find any. Saw the cheater vent and changed that. No smell this morning.
Thank you all for your help.
God bless

[Ron3rd]

Bad air admittance valve, AKA "cheater vent", maybe. Rule this one out. Easy to replace; about $10.00 at Home Depot

[Charlie_D_]

Look from under the flooring to see if anything has leaked. Drains on showers have a nut to pull the drain down for sealing. Seals have been known to leak and I have seen some nuts come loose.

[newman_fulltime]

look in your basemant at the bathroom floor around the toilet or shower drain for stained or wet wood

[cyntdon2010]

1st place to check is on the top of camper for a roof leak.
could be leaking down the walls.

[MFL]

Has it been a while since using RV shower, so maybe P-trap is dry, allowing odor from tank?

Jerry

[thefishingal]

Where should I look for the leak?

[newman_fulltime]

shower drain or toilet has a leak