how to clean fuel tank

[shabss]

read a thread about ethanol in fuel and which is not good for outboards
fortunately i only used ethanol for about 3-4 trips
but would like to know how do i go about cleaning my tank of the ethanol fuel
is it just simply a case of removing the tank and dumping the old fuel or do i have to clean the inside of the tank as well and if so how
and whats the best use of the old fuel
can it be used in cars, lawnmower or should it be disposed of properly
have about 7 litres of fuel in there
need to know before the friday as planning to use the boat on sunday

[Roughasguts]

Mate I wouldn't worry about 7 or so litres of ethanol fuel mixed with unleaded.
Either put it in your car or fill your boat tank with fresh fuel which ever way you do it, it will dilute the E10 fuel to E5 or less which would be acceptable.

[shabss]

no probs thanks