Barbecue cleaner is based on caustic (sodium hydroxide) or potassium hydroxide. Keep well clear of any aluminium, especially thin sections - like intercooler fins. I've seen plenty of kitchen grease filters totally disappear after a dip in caustic.
My two answers...
1. Unipart used to do an orange-based water-washable degreaser. Amazing stuff. Used in a tray, the soil would sink to the bottom and you just poured the clean degreaser off the top for re-use, then washed the parts with a a hose pipe. Since the demise of unipart I haven't yet found a good replacement. "Orange terpenes" is the ingredient on the tin.
2. Some catering suppliers sell "aluminium safe" degreasers, designed for doing bakery trays, kitchen mesh filters etc. ACE Filtration is one supplier which springs immediately to mind.
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