For those who are squeamish about bodily fluids, don't read this to the end.
There is a quantitative blood test for solvents, it's about $600. Otherwise, there is a qualitative urine test strip I've heard about (I'm still trying to find out who provides these). Basically, one can assume that solvents are present in everyone on the planet--see the Environmental Working Group
for more information than you probably want to know. It's whether or not they are affecting you in clinically relevant manners and how preventative you choose to be.
As for metals, I do a two-part urine test, using a chelating agent. I don't suggest the DIY approach in this area too much, unless you plan on post-treatment testing to confirm that the load has been reduced. I have used the cilantro/chlorella approach in the past, it has not been as effective nor time-efficient as the approach I'm using now.
My treatment approach deals with the metals and the liver, which combined with exercise, will definitely help get rid of the solvents. The proper diet, over a long period of time, will help get rid of these things, whether or not it can outpace the rate they are coming in is another matter.
For example, I have a model patient who has been extremely good about her diet and basic supplements for about 8 months now. She had an extensive history of antibiotic and medication use. She is now detoxing solvents. How do I know? She tells me that her BO smells like cardboard and she has a mild vaginal discharge that smells of RAID (insecticide). I'm glad that this stuff is coming out...now I'm simply trying to help her body accelerate the process...I have not done a toxic metals test on her yet, that is something I'm looking forward to...