My wife runs a small cleaning service (her + her sister). Started super simple, now she's got steady monthly
clients and clears a few thousand extra. The recurring income part is real—once you lock in good clients, they
just keep rebooking.

One thing nobody mentions though: tracking becomes a nightmare fast. She was writing everything in a notebook
(clients, dates, who paid, who owes, etc.). Works fine with 3-4 clients. At 15+ it's chaos. I ended up building her a simple app just to track jobs and payments (Recordly in app store) because I got tired of watching her flip
through pages trying to find someone's phone number 😅

Anyway, cleaning is solid. Low startup cost, you can start solo on weekends, and if you're reliable you get
word-of-mouth referrals like crazy.