Landlord contract clause legal?

Enforceable or not (I am aware of no reason why it wouldn't be enforceable), you are going to get into a situation with this LL. If the clause is struck but this is what is on the LL's mind, it seems you will never get back your full deposit since the LL will claim you did enough damage to necessitate repairs and deduct it from your deposit. Then what will you do? Go to court over $500? Doubtful. Either prepare yourself to deal with such a LL or move on.

If you agree to it and sign, it's legal and enforceable (although there's a big difference between "legally enforceable" and economically feasible to sue you for. but you may want to think that you'll be writing off whatever security deposit you put down.

in this life, you get what you negotiate, not what you deserve....