Here is a very interesting article; albeit a tad technical but it can still be understood. I have attached the hyperlink and a couple of interesting snippets from that article. I think that because of the aggressiveness or fast growth rate of bladder cancer, a cheap reliable test really is urgently needed:
National Cancer Institute Article
Because bladder cancer is almost never incidentally found at autopsy, the preclinical duration in which it has not yet caused symptoms, but in which it can be detected by cystoscopy, is probably brief. This rapid growth rate is supported by clinical experience and implies that screening would have to be performed at frequent intervals.
The use of cystoscopies and bladder wash/urinary cytologic examinations has proven quite successful in the surveillance and management of patients with previously treated bladder cancers. These means are not practical in individuals without a history of bladder cancer because of expense and morbidity.