Specific past/passed question?

Hello all,

My apologies first as I know this has been covered many times!

A friend wrote the following:

All we have to do now is clean up .... the strong wind blew the sand & rain passed my window seals at the front of the house.

I said he should have used past, rather than passed, he disagree's.

A large alcoholic drink rests on the outcome of this question!

Many thanks in advance.