Portsmouth, dover, rochester, somersworth, rye, hampton, north hampton, hampton falls, newmarket, newfields, seabrook, kensington, kingston, brentwood. Call us today for all your cooling needs! It’s dangerous because it’s highly caustic and if it’s powerful enough to unclog a drain, it’s powerful enough to be dangerous my mother used to help out a neighbor who had empty eye sockets and skin grafts.