What you need.....
Engine degreaser (one that will make the engine shiny, it will give a glossy finish)
Parts you want to de-chrome
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OK, get you parts you want to de-chrome and a tin/jar/cup, something to put your parts in.
Next get your engine degreaser, i use a spray one that leaves the engine shiny.
Next, simply place your parts in you tin and spray then with the degreaser, do not pour a cup of degreaser and put your parts in as it may start to eat the plastic.
Xmods, Revell and Tamiya parts take 2 - 3 hours before you can scrub the chrome off.....AMT takes around 5 - 6 hours.
Use an old toothbrush to scrub of the chrome.
Heres some i did earlier...
Revell Engine parts.
Xmods Mustang rims.