Cleaning and maintenance I have a gearless bicycle. I ride it about thrice a week. Its spokes are rusted. Any suggestions to clean the rust?
Also I need some good technique to clean the bicycle with rags and household material. Please help.
Spokes - a "steelo" or other brand of pot scrub.   Use warm soapy water, because the dirt is generally dirt not oils.   Its hard to get up in by the hub where the spokes cross - you might find a toothbrush useful.   If its a rear wheel, remove the freewheel/cassette first, and for either wheel try to not flood the bearings.   Use clean water to rinse.   You may need to check the truing of your wheel after cleaning too, the flexing may move a nipple or two.

If the rust doesn't move, you can upgrade to a brass wire brush, similar to what is used to clean barbeques.  Brass is softer than steel so it won't damage your spokes, but it may damage the alumunium rim or hub.  Prevent rust returning by brushing on a rust-fixative solution and letting it reoxidise the rust to white/black iron oxide instead of red/brown rust.   Then coat with some grey spray primer.   All this is easier to do if the wheel is disassembled, but that's a massive undertaking on its own.

If the rust is anything deeper than a surface skim, you'd be better off with new spokes.  Examine the bend at the hub for rust and wear too - that's a common place to break.

Remove anything electronic before cleaning, lights and computers etc.

For the rest of the bike, wash it with another bucket of warm soapy water.  Use a rag for the big areas, and a 1 inch twist of rag to pull through tighter areas.   That toothbrush can be used in fiddly areas like derailerus.  An old dish scrubbing brush can be good for getting dirt out of tyre treads.
Don't wash the brake pad surfaces directly, and do remember to rinse any soap off the braking rims.

If you have disk brakes, your last step should be to clean the rotors with Isopropyl Alcohol.

Finally for the pedantic, you can use tyre/tire black on the tyres (again mind the braking rims)  and a suitable leather or "car interior" treatment on a saddle.

If you're still making it better, consider a paint touchup on any part that needs it.  A flick of black spray paint on the handlebars does wonders for the look.

Put the bike to dry (both water and paint) and when its dried, re-lubricate your chain and any pivot points.

Do use the opportuinity to look for anything wrong on the bike - preventative maintance then follows.