Any product thats non-caustic,non-corrosive,so that you wont damage your customers surfaces just check the msds on your preferred product if its over 10 on the ph scale its highly alkaline and will cause damage, if its 5.5 or under on the ph scale its to acidic and will cause damage to your customers surfaces, these are recommended guidelines for safe cleaning, just ask your janitorial supplier to supply you with products that will not cause detrimental damage to your customers surfaces.