As long as you have adequate records and receipts for these expenses, there isn't an amount that is considered "too much". If you were not reimbursed for supplies/education expenses by your employer and can substantiate the amounts you are claiming, deduct them.
The same is true for cleaning costs of your uniform -- the definition of uniform is: work clothes are necessary for your job but not suitable to wear outside of work. For more information:
Job search costs that are deductible: you can't be looking for a job for the first time as a nurse or if there is a significant break in time between your last job or your current job.