Measure 1/4-cup vinegar into a large spray bottle. Vinegar is a mild acid that will effectively clean the cage but is non-toxic.
Add 1/4-cup linseed or olive oil to the spray bottle. The oil will condition and polish the wood and also is non-toxic.
Add 1/2-cup lemon juice. Lemon juice also is a mild acid and it will give the homemade cleaning solution a pleasant scent.
Screw the cap onto the spray bottle and shake the mixture well.
Spray the homemade cleaner onto a soft cloth and rub the wooden cage with the damp rag to remove dirt.