If you've got chrome fittings on the toilet seat and lid, a bit of Bar Keepers Friend on a damp toothbrush bringe them up like new. Then smear a little vaseline over all the chrome, wipe off excess with loo roll and they stay clean for much longer.
Bar Keepers Friend is also brilliant for cleaning round the door seals of the dishwasher, in fact it's brilliant for just about any gunky surfaces (not enamel though as it's acidic). Also brilliant for oven door glass.
Magic Eraser block by JML - cleans grubby marks off hard surfaces - it's brilliant for fingerprints on paintwork, stainless steel sinks, taps, a little miracle it is.
Shrunk jumpers - this only works up to a point and not sure if you can even get them any more, but soaking a shrunk jumper in a solution made of the enzyme tablets for contact lenses does make a difference, it's the enzymes.
A couple of points about previous tips - washing machine maintenance wash, there's no point using bio washing powder on the hottest setting as anything above 40 kills the enzymes. Vinegar or bleach (not together) works well. Washing powder tablets keep the drawer sparkiing - ours looks like new 5 year on, I use 1 tab instead of the specififed 2 to save money. Also if you can leave the door open whn not in use it prevents it going musty in the drum.
I tried lavender oil in the vacuum bag and it smelled horrible after a few days, like dusty mouldy lavender (and I love lavender).
Oh and the Veet down the plughole didn't work for me, but I might try it again.