It may depend on your printer ink. I have seen online that the current recommendation is to use only pigment ink (only some inkjet printers come with this) because it is water insoluble, making the photos permanent. Here is a link to Amazon reviews that mention washing these fabric sheets:
https://www.amazon.com/Jacquard-Fabr...ews-filter-bar
Here is a good website on this topic:
http://www.gloriahansen.com/articles.php?p=1&ID=14
If you have already printed all of your photos, there may be some way to help preserve them. I haven't researched that. I think the biggest problem is that, if the ink is dye-based rather than pigment-based, it is basically water-soluble. I'm not sure there is any treatment that can change that characteristic of the dye. Coatings that might protect the ink will eventually wear off.