Just a thought but If you have a washer hook up that's were my smell was coming from. My convection MW and washer hook up are close together and it took me a week to realize and find it. We don't use the washer drain so sealed it up with duct tape and no more smell.
2014 Palomino Columbus 3650TH
435AH 12V VMax Charge Tanks, 520 watt Monocrystilline Solar Array, Morningstar MPPT TS-60 CC,Morningstar Remote,Cotek True Sine Wave Inverter,Cotek Remote Controller,50amp Progressive Hardwire Surge Protector
2015 Dodge 3500 6.7L 4X4
2011 CanAm Commander XT 1000