As the cross is another stolen symbol, the cross by itself is powerless. If, however, it was "blessed" by a priest (or, worse, a rabbi), it will need to be cleansed. And, if you have a cross with the rag on it, it is best thrown away. Crosses with the starburst are far closer to the truth, in which the sun is on that cross.
For the record, the cross has numerous pagan meanings. The raised cross, turned upside down, represents the scaffolding of the chakras. The Southern Cross, upon which the sun "dies" on right before Xmas, is also representative of a pagan symbol. The Cross of the Zodiac, with all four segments of equal length, is blatantly pagan and should be observed as such. This equal-sided cross is the scaffolding upon which the sacred Swastika is built. About the only thing not pagan is that disgusting image of that kike on the stick--if that's on the cross, it renders it valued at melt value. (If it is made out of non-precious metals, that is zero.)
Now, if someone has that ugly kike star with the menorah, you have a bigger problem. True, the kike star is another stolen image. But, those who proudly display this star (especially with the menorah, which is only valued at melt value and then only if made of precious metals) are betraying their true allegiance. This holds true if one displays the cross (including the rag) along with that damnation book or other xian symbols. The combination of the above is worse than each part, and it's the allegiance that is objectionable.
As for clothing with crosses on them, usually those articles were "blessed" by a priest. It is this "blessing" that carries the negative energy, and often the articles were made for or by a church. Anything "approved" by a church is likely to have this bad energy on it. On the other hand, if someone innocently put a cross on an article (especially the equal armed cross), it might not be so bad--I could use that image as the foundation to make a full Swastika. Now, that wouldn't be so bad in the slightest.