What is the dress made of-chiffon, silk, shantung, satin, velvet, what? Is there beading or delicate embroidery on the dress-it's not just buttons and metal that can cause a problem in cleaning as lustrous beading and embroidery likely contain metals also, to add the lustre.
How much fabric is in the dress-is it going to be extremely heavy (and thus unmanageable) when saturated with the cleaning fluid? Read the Dryel label to see if you can clean your fabric with it, and don't be surprised at any disclaimers absolving them of responsibility should the cleaning job be unsatisfactory-there may be hidden stains from spills, perspiration, etc, that cleaning will unfortunately expose for all time.
If you can afford it, a professional fabric restoration service would be the best way to clean an heirloom wedding gown.
I'm sorry, but I wouldn't do this at home. You never know what you could do that will damage it. Get it professionally cleaned.
Please don't try to do this at home. Likely this dress is sentimentally valuable to you-invest in having it professionally cleaned. Go to a cleaner that specializes in cleaning antiques and can then package it in a box and tissue that is archival quality.
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