To make a tax-deductible donation to help with upkeep costs such as re-applying sealer on the Portland Music Mural every few years, please visit the project's fiscal sponsor, Artichoke Music. 
The link will go to the PMM donation page, and there is a place to put in the note that is for mural maintenance. 

For donations of $200 or more, the donor's name can be listed on this website, and be mentioned in a social media post and email, if the donor would like.