the suggestion of the 'Snake_Bit'
for cleaning out EGR passages is interesting,
but it also brought up in my mind a cheaper
alternative from work
.... in mining/quarries/grain elevator industry, to splice together rubber conveyor belts, there is a type of splice that uses as a connection pin a 30 to 60 inch long stainless steel cable with crimped on stainless steel end caps. They are about 3/16 or 1/4 inch diameter. A lot of these splices get routinely cut out of conveyor belts and end up in the trash. I am going to keep an eye out for some of those cables to chuck up in a drill and may try them as 'snake-bit' alternatives.