
A customer has brought back two photos for the third time and I am just about to throw the towel in. Sobbing session now over, could you advise me please?
Graduation photos, already in a mount from the photographer with the university logo. The mount itself has little 'raggedy' bits on the the cuts which are shedding dust.
The first photo, I used a tissue to wipe around the edge of the mount to remove the little specks. I hadn't realised this marked the photo (even though I was as light handed as I can be). The customer wants me to replace the photos to which I have agreed. I have already re-made one frame as there was a small flaw in the moulding I missed - again, fair enough but as the cost of the photos are more than the frame so I am into loss territory already.....

The second photo was returned because I missed a speck of dust. Fair enough. It has just come back again because of more dust which I struggled to see even when pointed out, but the customer is always right - yes? Hand-on-heart, I went over with a magnifying glass and couldn't see any when I handed it over. I sealed the glass/mount sandwich this time too, to avoid any 'dust pump'.
My question is how to stop dust on the photos and clean away any that has settled. I am so loathe to wipe them and risk marking them again. But I don't know what else to do or what else I should use. I used a soft tissue - would a microfibre be better?
I always use paper towel to clean the glass and had this on the counter, but the customer tells me I am wrong and "wants some effort put in".
Any advice pretty please?