HG window cleaner concentrate - guaranteed streak-free windows - super concentrated - sufficient for at least 35 washes - professional window cleaners use it with good reason! HG window cleaner concentrate is a super concentrated product that cleans and degreases without streaks, but does not contain ammonia or spirits. No wonder professional window cleaners use this product. HG window cleaner concentrate exceeds every professional requirement - this HG product has a neutral pH, which means it is safe for paint, lacquer and plastic and very mild to the skin.