Kinda funny. Welcome. I haven't really seen fluid filled transformers except the big ones 100 kV or the ones used for power distrbution. If the transformer's "fluid" is har and usually yellow, it's a varnish used to keep the core tight.
Your right. No tounge. That's the way my kid friends of decades ago used to test 9V batteries. MOST, I said most, caps will have bleeder resistors if the designer expected them to hold a charge. Caps rated in the kV range will develop a charge by looking at them. You have to store them with keepers. Consumer stuff is not going to be that bad so don't mind me scaring you.
A voltmeter on the range of the rating, usually expressed in VDC or WVDC in old times) of the cap across the cap will tell you if it's OK to touch. The big capsinthe 10's or 100's of UF are usually filters and are good to check to ground to see if you can now use your fingers.
Cap's can be discharged with a resistor. Estimate the voltage and pick a resistor and make sure I^R is within the rating of the resistor. Within 5*R*C, the voltage should be gone. ex. 5 * 1e-6 (for 1 uf) * 1,000,000 ohms, or within 5 seconds the charge will be essentially gone, but wouldn't hurt to check.
There are sites better to help you with replacement parts for restoring tube electronics such as **broken link removed**.
Feel better?