Toy rotation has many benefits. It allows you to keep your child's toys clean and in good condition. It also allows you to ascertain how many there actually are, as well as whether some may have been out grown. Rotating them can mean your child begins to appreciate them more, and can become excited and pleased to see old friends as they reappear after a wash and appraisal.
The best way to rotate toys is to have two toy boxes. One should be in your child's bedroom, or playroom and the other should be in a laundry room, or another room where your child doesn't play. The box in your child's domain should contain toys in use, and the one in your own domain should have toys in that have been removed for now.
Most children have a favorite toy which gives them comfort. Removing it would leave them devastated. In such a case you can still check the toy to see if it is in need of maintenance, but there is no reason to take it away unless it is genuinely in need of cleaning or repair.
With other toys, the opposite may sometimes be true. It could be that there are certain toys that keep going from one toy box to the other, but apart from that never see the light of day. When this happens it can afford parents with an opportunity to teach their child about not keeping items simply for the sake of it.
More importantly it can teach a child about sharing and about how good it feels to help out others in need if they make the decision with you to donate unused toys to charity so that another child can make use of them.
When checking the condition of other toys in the rotation box look for games that have missing pieces, toys which need sewing or fixing to restore and those which would benefit from a wash.
Most soft toys can easily be cleaned by popping them into a washing machine. Those which are plastic can be most quickly, and hygienically, cleaned with medicated wet wipes.
When you return toys, fresh and reconditioned, your child will be delighted and will also benefit by learning that material objects need to be cared for and maintained in life. Hopefully this knowledge will stay with them and they will be able to make positive use of it as they mature. Thus toy rotation will have had far reaching benefits.