Washing that black stuff from trees off my truck

[Woogeroo]

hiyas folks.

so, I have my old '65 chevy truck... old everything... but the truck sits around, under or near several trees. Pine trees, big holly trees, oak trees mainly... and it gets this black powder dust junk on it and it is a pain to get off.

Also, I have a few grease/grime hand/fingerprint spots I got on there and I need to get off.

Any suggestions? triead my auto washign soap... dish washing soap...

I'm not much into washing my truck very often but it got pretty dang dirty... heh.

Any tips, tricks or product recommendatiosn appreciated.

thank you,

-W