Stainless steel is not listed among approved surfaces, and the product’s chemistry and pH are undisclosed. A grout cleaner may affect stainless-steel finish or leave residue.
Why
Official evidence limits stated compatibility to ceramic, porcelain, granite, quartz tile, and sealed grout. There is no verified evidence establishing compatibility with stainless steel.
What to do
Avoid routine use. If necessary, test first on an inconspicuous area and remove promptly according to the label; do not use on delicate, coated, or brushed finishes without confirmation.
pH
Not disclosed in retrieved manufacturer evidence.
Relevant chemistry
No named chemistry or pH was shown in the retrieved manufacturer evidence.
Source: official product page ↗