Is Salaat behind Salafis valid?

Answer

One should try to avoid performing Salaat behind Salafis and any kind of bid'atis. Nevertheless, if one suffers the misfortune of being behind a Salafis, the Salaat behind them is valid. But if it is known that the imam has made masah on ordinary socks, then Salaat will not be valid. These people don't wash their feet. They make masah on ordinary socks.