TFS 1.X+ How to prevent map clean from removing specifici items

[SixNine]

I heard it can only be achieved trough src. Can someone guide me a good way how can i make sure it wont delete specific items or maybe like creating a items.xml attribute like <attribute key="mapclean" value="1" /> which means it wont delete the item on clean or maybe hardcode it with if statement somewhere in src idk where

 

[Hardtoregister]

local itemsToSave = {2001, 2002, 2003}
if not isInArray(itemsToSave, item.itemid) then
--delete items that's not in array
end