Cleaning & Detail Tips

[ZR1@LAST]

Please suggest the best products to use for the following:

I am trying to clean the underhood hard plastic panel and the plastic radiator shroud, etc. I cleaned it with distilled water and soap. Now I have streaks and no finish. What do I need to do to "clean" it and "dress" it. It has a mat finish and don't mind if the product is a little shiney, but not a dust collector?

What is the best product to condition leather seats to prevent cracking and minimize wear? I remember the old way using saddle soap, but have not seen that in years? ))

Same question as above, but for the rubber seals- door, etc.?

Thanks as always ))

Jeff
90 ZR1
Red/Red