Soaking (water only) - 1915 Cracker Jack?

[Belfast1933]

I recently picked up a great 1915 CJ card here from a board member (thx Ian, great transaction) and wanted to ask this group about anyone’s experience with water soaking to try and clean some dirt from the back of the card.

I don’t want to get into the chemical washes that are out there but just distilled water, light touch cue tip to try and remove the dirt from the back. I’ve only done a few to remove glue, which seems to work well.

My question - I believe the 1915 CJ card stock is a little more hearty than 1914 but wanted to ask if anyone knows of risks like print running, etc. Not sure I want to try without first a test - but I hardly have any 1915 Cracker Jack Commons around to test this on!

Anyone ever give a water bath to a ‘15 CJ and live to tell about it?

Thx all

Jeff