trees are kept alive by bark. its what transfers water and feeds the tree. a 2-3 inch ring of bark removed near the base will starve the tree and kill it causing preservation orders to defunkt.
Copper also poisons trees, copper nails hammered deep into the tree to the point they disappear will also cause the death of a tree, the bigger the tree the more nails required, defunkting protection clauses
protected tree's are only protected via a fine if cut, the fine is rarely more that £50-£200 for the felling of said tree depending on its size
all this is mere internet waffle from a cherry shaped forumite that is a happy tree huggin vegetarian ma'lud
... who no longer suffers with over hanging trees on his drive (except a cool looking oak at the end)
... as for detailing spray... no idea