300 tdi fuel tank cleaning

Hi all. I have drained the tank and most of the mixture was clean.The mixture I was using was unused cleaned contaminated rape seed oil and 20%petrol.The bottom of the tank has quite a bit of yellowish sediment in it.Could I use some petrol to wash it out ie via my suction hose.Any advise will be greatly appreciated.
306james

yes and luckily you can get your arm in through sender hole

Many thanks for the reply.Cant get my hand in as the sender unit is in the way and I don't want to try and disconnect the rusty pipes.I can get a piece of hose pipe in.That's how I drained the tank.
306