Anyone sharing needles is at risk when reusing needles. While attempting to clean with bleach is undouboutably helpful unless done correctly there may have been a risk.
Have the HCV RNA test and wait for the results. Wondering how you may have become infected is not really important the only important thing is finding out if you have hep c.
Also now that you understand the risk of contracting hep c avoiding activities that put you at risk is even more important.
If you do have hep c doing things to minimize the risk of transmitting the virus to others like not sharing drug works EVER and not sharing items that could be exposed to your blood like fingernail clippers, razors, or toothbrushes. Using care if you have a bleeding wound by covering the injury with a bandage and cleaning g up any blood spill with a 10% bleach solution.
But again first find out if you are currently infected with hep c.
The thing about plastic rigs is they're porous... If youblok where the point comes into contact with the shaft you'll commonly see a spot of blood that won't clean or go away no matter what. Even bleach won't make it budge. Then there's the cooker and the cotton. You are absolutely at risk. Even with bleaching as the plastic is porous and bleach rinse may only get the surface. Be careful and try to never share works. Also I'm not judging. I am 11 1/2 years sober. I'm here if you need to talk