No. Elemonator in itself is harmless. It’s when it suspends the SH in it that the alkalinity leaves the lines so far as I can tell. It rinses super easy on vinyl and painted surfaces, but nothing with a soaping/sudsing property will be easy to rinse out of something porous.
Elemonator is 1000x better than dawn or gain or whatever some of these folks are using. Rinses so easy, but does it’s job in helping the SH stay on the surface. Dawn bubbles forever and is so dang hard to rinse with cold water.
Just use less Elemonator than the suggested usage. It’s too much in my opinion. IBS said they use 8 oz in 35 gallons, but I like 3 oz to 5 gallons for myself.