I soaked my intake manifold upper and lower in power purple over the weekend. that hard crunchy gunk on the inside of the manifold just dripped away. I have polished all of the mateing pieces. but to get the power purple residue and any metal shavings off I have decided to put them in an extra hot wash in my dishwasher. again they're already pretty clean this is just to get the excess the greaser film off of the intake. good idea bad idea?