You can't claim these expenses as a deduction on Schedule A. As MarilynG1 points out above, cleanup expenses can only be used to reduce the fair market value (FMV) of your property.
According to Publication 551 (12/2022), Basis of Assets:
FMV is the price at which property would change hands between a buyer and a seller, neither having to buy or sell, and both having reasonable knowledge of all necessary facts.
See also Casualty Losses in the IRS's Topic no. 515, Casualty, disaster, and theft losses.
@worrallern
