How's this for a legal strategy:
1) Remove all the crap from the beaches
2) Allow people to bring suit for any confiscated property and reimburse them for all property removed
3) Fine the folks in #2 for violating Endangered Species Laws (since they gave written legal testimony that they owned and left the items on the beach).
4) Collect fines, court costs, and 2x the amount they were reimbursed in judgment and use it to fund the clean-up program