Turtles typically breath through their noses so if his nostrils are clogged, you may be seeing him take air in through his mouth. Or he could have soap in his mouth like you said.
If you feel up to it, you can take a tooth brush to his shell. I used to use old tooth brushes to get algae off my turtles' shells.
And I'm pretty sure that is not a snapper.
Okay, I'll take a toothbrush to him after this next thirty minutes is up. I just wanted to get the thickest layer off. At least now he actually looks like a turtle
Females
0.1 wildtypes [Rosca] 0.1 pastave [Persephone] 0.1 mutt redtail boa [Serendipity]
0.1 false water cobra [Artemis]
0.1 white lipped python [Pandora]
0.1 super tiger retic [Callie]
0.1 leopard gecko [Adelita]
0.1 diamond dove [Pidgey]
0.1 hairless dumbo rat [Scarlett No Haira]
0.2 dumbo rex rat, fancy rat [Fern, Harley Quinn]
0.1 gerbil [Katrina]
0.1 mouse [Snow White] 0.1 cat + kittens [Mama Cat]
0.1 African Dwarf Frog [Zelda]
?? molly fish
Males
1.0 fiancee [Patrick]
1.0 Argentine b&w tegu [Emrys]
1.0 hypo red bearded dragon [Zammy]
1.0 bumblebee [Zerok]
1.0 albino king snake [Dumbledore]
1.0 diamond dove [Julius]
1.0 dumbo rat [Ratrick Stewart]
1.0 gerbil [Sven]
1.0 betta fish [Casanova]