To get perfectly spotless windows and mirrors, without chemicals

Use a solution of water and regular vinegar. (About 1/2 cup vinegar to 2 cups water), spray and wipe. This solution will not streak at all. It is the best and cheapest way to clean glass. You can increase the amount of vinegar for very dirty glass.

Crayon On Walls

The only method I found that worked quickly and easily was to use white spirit (mineral Spirits) and an oily rag. It works a treat, but be careful on emulsion walls (it works best on vinyl and gloss).

Cleaning Laminate and Wood Floors

It is critical not to over wet laminate and wood floors to prevent damage and the build up of residues. Aaroma recommend the use of a good quality mop (preferably with a polypropylene head to prevent over absorption and waste of cleaner) and a dedicated hard floor cleaner. Using washing up liquid will ultimately lead to a build of cleaning chemicals residue (causing the floor to get dirty more quickly) and a streaky finish to the floor.