In this context, "slime" refers to a separate thing called "黏土" (niantu) in Chinese, which means "clay." It does not refer to "浑水" (hunshui), which means muddy water, or "污水" (wushui), which means dirty water.

Example sentences:
1. 孩子们正在享受制作黏土的创意体验。 (Háizi men zhèngzài xiǎngshòu zhìzuò niantu de chuàngyì tǐyàn) - The children are enjoying a creative experience of making clay.
2. 我们在这里提供黏土工艺课程，让孩子们尽情发挥创意。 (Wǒmen zài zhèlǐ tígōng niantu gōngyì kèchéng, ràng háizi men jìnqíng fāhuī chuàngyì) - We offer clay art classes here, allowing children to unleash their creativity.

I would use 橡皮泥.
https://www.amazon.com/Pack-Dual-Color-Slime-Toy/dp/B0C9J2DP...