You can use the leftover debris from car washing to grow roses, and the effect is quite good

To save money, I always wash my car myself, and at the same time enjoy the fun of getting the car spotlessly clean. Unexpectedly, the car-washing water, plus the debris from car washing, turned out to be a treasure for my roses.
Because the house I live in is a single detached building, I can put the car at the door to wash it. Every time I fetch water from the first floor to wash it, and by the end of the wash, the water is still clear. It should not be wasted, so I use it to water the roses!
But I do not water directly. Instead, I put the carbon packets from the car into the water and soak them for one night. The next day the water is clear. Then I open the carbon packets, crush them with my feet and put them into the rose flowerpots, just sprinkling them on the surface. Then I pour yesterday's leftover water into the flowerpots together.
The principle of using carbon packets to grow roses: carbon itself has a very good adsorption function, and can absorb impurities in the water, making the water quality softer and more favorable for the roses to absorb. At the same time, crushing the carbon packets and putting them into the flowerpots allows them to absorb water well, keeping water for the roses without waterlogging. The roses never get root rot, and every time you water, you can ensure the water quality, and it can also prevent the soil from becoming compacted.
However, besides watering, in the daily care of roses, you still need to pay attention to ensuring fertilizer, to promote plant growth. Roses that only drink water will not grow very big flowers. Besides the rose soil being relatively fertile, after it can retain fertilizer for half a year, apply more.