So after Andy made me feel guilty for changing my belt without doing the tensioner a few weeks back i ordered a new Ford Tensioner and put it on...... well i noticed how nice and silver the new tensioner was and realized my engines lookin kind of dingy.... specifically up top on the valve covers.... so my question is, what’s a good product to wash down the valve covers and aluminum parts with that will take off that white crud? I’d like to clean up the top end, i already cleaned all the plastic parts and they look great next to the corroded aluminum surfaces. Any engine with an aluminum head gets this over time obviously, at one time my motor would have looked like this lol: