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Tips for dealing with photo etch - removal from rubber backing:

Soak light-weight or fragile pieces in acetone until the part separates from the rubber backing.  For heavier parts that have no etch lines or thin edges where there is a likelihood of damage, you may be able to peel the rubber off before soaking in acetone.  It works best to fold the rubber back against itself as you peel it back to lessen the likelihood being parts.