Fixes decals causing 20k runtimes and blood not cleaning (#53967)

decals will unregister signals and wont try to clean twice

code/__DEFINES/dcs/signals.dm

@@ -672,8 +672,6 @@
 	///Returned by cleanable components when they are cleaned.
 	#define COMPONENT_CLEANED	(1<<0)
 
-///from base of datum/component/forensics/wipe_blood_dna(): ()
-#define COMSIG_WIPE_BLOOD_DNA "wipe_blood_dna"
 
 //Creamed
 

code/datums/components/forensics.dm

@@ -43,7 +43,6 @@
 
 /datum/component/forensics/proc/wipe_blood_DNA()
 	blood_DNA = null
-	SEND_SIGNAL(src, COMSIG_WIPE_BLOOD_DNA)
 	return TRUE
 
 /datum/component/forensics/proc/wipe_fibers()

code/datums/elements/decal.dm

@@ -36,8 +36,7 @@
 	return TRUE
 
 /datum/element/decal/Detach(atom/source, force)
-	UnregisterSignal(source, list(COMSIG_ATOM_DIR_CHANGE, COMSIG_COMPONENT_CLEAN_ACT, COMSIG_PARENT_EXAMINE))
-	UnregisterSignal(source,COMSIG_ATOM_UPDATE_OVERLAYS)
+	UnregisterSignal(source, list(COMSIG_ATOM_DIR_CHANGE, COMSIG_COMPONENT_CLEAN_ACT, COMSIG_PARENT_EXAMINE, COMSIG_ATOM_UPDATE_OVERLAYS))
 	source.update_icon()
 	if(isitem(source))
 		INVOKE_ASYNC(source, /obj/item/.proc/update_slot_icon)

code/datums/elements/decals/blood.dm

@@ -1,5 +1,4 @@
 /datum/element/decal/blood
-	//dupe_mode = COMPONENT_DUPE_UNIQUE
 
 /datum/element/decal/blood/Attach(datum/target, _icon, _icon_state, _dir, _cleanable=CLEAN_TYPE_BLOOD, _color, _layer=ABOVE_OBJ_LAYER)
 	if(!isitem(target))
@@ -7,8 +6,11 @@
 
 	. = ..()
 
-	RegisterSignal(target, COMSIG_ATOM_GET_EXAMINE_NAME, .proc/get_examine_name)
-	RegisterSignal(target, COMSIG_WIPE_BLOOD_DNA, .proc/Detach)
+	RegisterSignal(target, COMSIG_ATOM_GET_EXAMINE_NAME, .proc/get_examine_name, TRUE)
+
+/datum/element/decal/blood/Detach(atom/source, force)
+	UnregisterSignal(source, COMSIG_ATOM_GET_EXAMINE_NAME)
+	return ..()
 
 /datum/element/decal/blood/generate_appearance(_icon, _icon_state, _dir, _layer, _color, _alpha, source)
 	var/obj/item/I = source