I've just noticed the sodden wet chipboard flooring under the cupboard in the utility room next to the washing machine. A first look found a leaking waste pipe from the sink but after sealing that the floor stayed wet. Finally I've found that the pipework end of the cold water fill hose was leaking too. It's probably been doing it since I moved in two and a half years ago and fitted the washing machine. After an inordinate amount of buggering about with plumbers tape which achieved nothing and then that plus silicone sealant I've got the thing water tight. There were no rubber washers in the ends of the fill hose. In fact I don't recall ever seeing them in any of those hoses in my entire life. It's just the hard plastic end which abuts the outlet from the machine at one end and also the pipework thread at the other.
Should there be a rubber washer or not or should the plastic hose end seal if you do it up tight enough?