With those items mention in niddah eggs onions garlic and water. Do they effect the keli they were in? Does the keli have ruachrah?
It is not an issue, as the poskim say that the ruach ra only applies to the actual food and not to the kli (although you may want to wash it out).
Mitzyon Tetzey Torah 1-297 in the name of Horav A. Nebenzahl shlit”a, Shevet Hakehosi 4-203, Alei Siach pg. 222-8 in the name of Horav C. Kanievsky shlit”a.