how should i clean a leather sofa that has developed a mildewy

>>343939
Sounds you brought in a barn find.

If it's real leather it's not difficult to clean, just use designated products. There are even YT videos to give advice on them.

If the odor puffs out when you sit on it you may have something going on inside the paddings. I have found dead rats, snakes and insect colonies inside furniture fillings. Also mildew.

t. amateur but avid furniture restorer.

>>343950
no barn find, the city water has smelled musty here lately, think it's rubbing off my skin and clothing. I also rest my head on the arm rest all the time

>>344022
Ok, then just clean it with leather cleaning stuff. Really no brainer, just use right products. You could visit a furniture store where they often sell those cleaning kits. Probably not a surprise but The most asked question about leather sofas is how to clean them.