Y tu madre tambien, Rob; no winners my tuchas. TWO winners is the way I see it!!
Actually, I am somewhat confused as to why alkali would strip anodizing from Al.
Just to make sure I understand the problem: the parts stripped (receiver and trigger guard) WERE Al?? The bbl. ( probably steel, but remember Rem. had some .22's with Al sleeved steel bbl's; Al over steel) around that time, was indeed steel, and unaffected?
What, specifically is Dicro-Clean 909?? It sounds like a detergent cleaner, which would make it more probably very, rather than slightly, alkaline. Since acidic solutions are usually the ones associated with attacking metal, but some notable exceptions exist ( warm alkaline spring water dissolved stainless steel grid used in archeological exploration; some chemist explained why simple galvanized steel would have lasted); what was going on here??
A more technical elucidation seems warranted.
Walt