First of all, it needs to be made clear that flowering branch rats are very clean and hygienic pets. If you find it disgusting to raise them, it is possible that you are not taking care of them properly.

The following are some of the possible causes of uncleanliness or odor in flower branch rats:

1. Not changing the bedding or padding regularly.

2. Not cleaning the cage often enough, leading to waste and urine buildup.

3. Unhealthy diet of the Flowering Branch Rat, leading to strong odor of excrement.

The solutions to these problems are:

1. Regularly change the bedding and matting in the cage so that the Flowering Branch Rat has a clean living environment.

2. Clean the cage at least once a week to remove waste and urine to maintain cleanliness and hygiene.

3. Choose high quality, nutritionally balanced food for your mice and avoid too much cheese, candy or other unhealthy foods. In this way, the flower branch rats' feces will be less and less smelly.

Other than that, there are some ways to keep your mice clean and hygienic:

1. Containers that provide water and food to your mice should be cleaned regularly to keep them clean and hygienic.

2. Bathe your mice regularly, but don't use harsh detergents on them. It's best to use odorless shampoos or soaps specially prepared for mice.

3. Clip the claws of Flower Twig Rats regularly to prevent them from scratching themselves or getting other bacterial infections.

In short, to keep Flowering Branch rats clean and hygienic, you need to give them a proper living environment and provide them with healthy food. With regular cleaning and maintenance, the Flowering Branch Rat can stay clean and become a lovely pet.