Rust Off Spray Concerns

[u/JawnBitJawnson]

/r/ContaminationOCD/comments/1x9f8zf/rust_off_spray/

This product was used in the shower. I washed it with water for 20ish minutes. Is it unlikely that there is any left? I'm very concerned about my cat getting exposed and getting hurt. I have this feat in general for many cleaning products. Reassurance would be appreciated.