I find I get motivated by:
1) the threat of company LOL
2) a desperate need for something (like clean dainties or a certain piece of paper)
3) buying something new always leads to cleaning (not new as in more clutter but new as in either replacing something you already have that is ancient or malfunctional, or getting something I've coveted for a long time that needs to have a good home somewhere)
4) small bites often lead to bigger bites (tidy a tiny area or declutter for a timed byte, sometimes a lil progress begets more)
5) polishing faucets or anything chromed or shiny (yesm I know tis weird but when the faucet or door handles are shiny & sparkling you wanna clean around em so they have a splendid setting.....at least I do)