Much like plant-based meal options, vegan and cruelty free cleaning products are those which have no connection to sentient animal life. They have not been tested on animals nor do they include any animal products within them. Vegan is more than just a diet, it is a lifestyle that ranges from the food you eat to the clothes you wear and the businesses you support.
Cosmetics have been tested on animals for decades. Many people do not agree with this practice and contemporary movements are striving to end the practice of using animals as test subjects for makeup and cleaning products. In the early drafts of these products, before they are suitable for human use, they may reap horrific side effects on the animals in question, including rashes and burns.
Rats, rabbits, and mice are all common animals subject to scientific testing. That said, there are companies who study the behavior of these animals more so than the effects of a product upon them. When the health or life of an animal is not at risk, the science is usually of no concern. That said, it is important to research the ways that animals are used to test cleaning products because they can be permanently damaged by the process.