8 speed is fine for pootling around and even commuting/touring, if you're not aiming for blistering speed and use a suitable chainring - maybe a 40t if you can get up to 30t or 32t on the cassette. For sprucing, I'd just give it a blast/soak/wipe with GT-85 or similar, which should get most muck off it with a toothbrush & cloth approach. It doesn't look too grubby.
8 speed is fine for pootling around and even commuting/touring, if you're not aiming for blistering speed and use a suitable chainring - maybe a 40t if you can get up to 30t or 32t on the cassette. For sprucing, I'd just give it a blast/soak/wipe with GT-85 or similar, which should get most muck off it with a toothbrush & cloth approach. It doesn't look too grubby.