I want to do a large glue-up collage on a building with composite-siding (cinder block underneath).

If I use wheat paste for my adhesive, can it be power-washed off successfully after 2-3 months without destroying the siding? If something only needed to stay up for 1-4 weeks, what adhesive would you go with?

It’s not a permanent installation unfortunately, so I have to troubleshoot removal…