if your pals do not complain when you are hanging with them,,the room needs washing,bicarb,murphs oilsoap
a couple treatments with lysol w the ingredient that kills trychophyton mentagropytes
a shop vac,hose concentrator ( to a point) nozzle,remove the cannister filter
so it blows with max pressure
get a bottle 8 oz any bottle with a 3/4 in neck like a coke bottle,fill with 2/3 water,the rest with the lysol.
get a spray stem from a windex cleaner bottle
turn on the vac,holding bottle in your favored hand,aim the air blast across the stem showing from bottle,ought to make a fine mist,hose down the room,every crack & corner,under the bed, in the closet,
stick a towel at the door bottom after you leave,,let it sit & dry out a couple hours,,,repeat,the problem is likely the clown painted over mold,thinking KILLZ would do the job,,,, it does not work on really filthy surfaces like yours