Recently became custodian of this old girl; my first classic. So much to learn; quite fascinating. E.g. the wheels can be removed without spanners, the front mudguard stay doubles as a stand to remove the front wheel, the rear mudguard is hinged & lifts to remove the rear wheel. I need to get her running; she has been stored away for a few years but I understand ran nicely at that point; I will then decide whether to strip & restore or keep original (ish) Need a 6 volt battery & charger; think I have that covered now. I need to clean the inside of the tank; it looks a bit rusty in there. Any tips for doing this?