are "donations" to Good will tax deductible?

I wonder how seeing it's a private company with no obligation to charity.

I was asking because I started a offshoot company and was wondering if I could give people receipts for donations and them be tax deductible?

My company already donates 100% of proceeds from scrap metal sales to charity, so I'm already giving back in that way.
Unlike Goodwill I won't trick people into thinking I'm a charity and they do a lot of good donating to me. Instead I plan on saying "I'm a company and I want you to give me things so I can sell them at high profit, but many items that can't be sold (30-35% of them) will be scrapped and all iron/copper and aluminum sales will go to charity. In addition we provide our services free to the ASPCA and many area churches and the donations would offset that".

So I wouldn't outright lie like Goodwill, to where everyone thinks it's a charity, but I would like to make donating more appealing. Currently I buy the items, but many people throw them out anyway. Our ROI on these items is through the roof and it keeps items from going to the dump and allows for people to have used options (all with 90 day warranty).

I was just curious what you have to do to be able to accept taxable donations?