No, it is not. Denwax Clean and Care is very effective for garden furniture, but also works effectively for cleaning and care on many other materials.
Denwax Clean and Care can be used on this:
DENWAX CLEAN
Used for cleaning leather, leather look, aluminum, travertine, fiberglass, linoleum, vinyl, rubber, mosaic, marble, oilskin, plastic, leather look, lacquer, concrete, granite, slate, terrazzo, metal, nonwood, ployrattan, composite, nappa and natural stone. It can also be used as a soap treatment on untreated wood.
NOTE: light aniline leather may darken one or two shades when using Clean. If in doubt, always try an inconspicuous place first
DENWAX CARE
Used for the care, protection, maintenance and impregnation of leather, vinyl, rubber, (untreated, waxed, soaped and oiled wood), marble, nappa, plastic, metal, aluminum, linoleum, terrazzo, granite, slate, natural stone, travertine, gore-tex, lacquer, leatherlook, nonwood, polyrattan and oilskin. Note: vinyl, lacquer, linoleum and high gloss should be polished with a dry cloth a few minutes after treatment.
NOTE: light aniline leather may darken one or two tones when using Care. If in doubt, always try an inconspicuous spot first.