Dirt overlay fixes

code/modules/mob/living/silicon/robot/robot.dm

@@ -1168,6 +1168,9 @@
 			var/turf/tile = loc
 			if(isturf(tile))
 				tile.clean_blood()
+				if (istype(tile, /turf/simulated))
+					var/turf/simulated/S = tile
+					S.dirt = 0
 				for(var/A in tile)
 					if(istype(A, /obj/effect))
 						if(istype(A, /obj/effect/rune) || istype(A, /obj/effect/decal/cleanable) || istype(A, /obj/effect/overlay))

code/modules/reagents/Chemistry-Reagents.dm

@@ -1299,7 +1299,9 @@ datum
 
 					for(var/mob/living/carbon/slime/M in T)
 						M.adjustToxLoss(rand(5,10))
-
+			reaction_turf(var/turf/simulated/S, var/volume)
+				if(volume >= 1)
+					S.dirt = 0
 			reaction_mob(var/mob/M, var/method=TOUCH, var/volume)
 				if(iscarbon(M))
 					var/mob/living/carbon/C = M