Why not the famous brand of cola, it is always being shown as being great for cleaning coins!?
Would be interesting to know what effect fosforic acid ( the rustbusting part in the aforementioned softdrink ) may have on the composition of sintered carbide parts....
It will ( eventually ) convert rust to fosfate - so the carrier ( blade ) might benefit.
Coffee contains some low density lipids, these might act as a solvent to the resinous gunk on sawblades.
These LDL's ( yes, they're the BAD lipids ) get filtered out when using filterpaper, so it may be necessary to use unfiltered coffee, or just use the leftover grit. Worth a try...
Regards,
Job